Leadless ohmic electrode silver coating for PTC ceramic and its preparation method

A technology of silver paste and ceramics, which is applied in the manufacture of resistors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve environmental pollution and other problems, and achieve strong process adaptability, wide firing temperature range, and aging resistance The effect of superior performance

Inactive Publication Date: 2006-11-29
HEFEI SHENGDA ELECTRONIC TECH IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this slurry will cause greater pollution

Method used

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Examples

Experimental program
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Effect test

Example Embodiment

[0038] 1. The organic carrier in the lead-free ohmic electrode silver paste for PTC ceramics is composed of ethyl cellulose, rosin, castor oil, and terpineol, and its weight percentage is

[0039] Ethyl cellulose 7%

[0040] Rosin 2%

[0041] Castor oil 2%

[0042] Terpineol 89%

[0043] The components are mixed thoroughly and heated at 100°C to fully dissolve the ethyl cellulose and rosin.

[0044] 2. Lead-free ohmic electrode silver paste for PTC ceramics, which is composed of silver powder, nickel powder, zinc powder or aluminum powder or any mixture thereof, and an organic carrier. The weight percentage is

[0045] Silver powder 42%

[0046] Nickel powder (or zinc powder or aluminum powder or any mixture of zinc powder, nickel powder, aluminum powder) 28%

[0047] Organic carrier 30%

[0048] Silver powder is selected from spherical silver powder with a particle size of less than 1μm; nickel powder (or aluminum powder or zinc powder) is selected from spherical powder with a pa...

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PUM

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Abstract

A method for preparing silver size pole of lead free ohm electrode used on PTC ceramic includes mixing and grinding silver micro powder, zinc powder and organic carrier together to obtain silver size pole material then firing obtained material at temperature of 480-580deg.c to let electrode layer attached on surface of ceramic body tightly for forming excellent ohm contact property.

Description

technical field [0001] The invention relates to lead-free ohmic electrode silver paste for PTC ceramics. Background technique [0002] Since PTC (Positive Temperature Coefficient Thermistor) ceramics is a semiconductor ceramic material, an ohmic electrode layer must be formed on its surface during the manufacturing process to eliminate the surface barrier of PTC ceramics so that the electrode layer and the ceramic body Form a good ohmic contact, and its various electrical properties can be reflected. A layer of silver electrode layer is made on the ohmic electrode layer so that it can be brazed with leads or pins. [0003] PTC ohmic electrode silver paste is usually formulated and processed from silver powder, zinc powder, glass powder, organic carrier and other raw materials. Silver micropowder and zinc powder are the main components of the slurry, which play the role of conducting electricity and eliminating surface barriers in the electrode. The glass powder is melted d...

Claims

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Application Information

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IPC IPC(8): H01B1/20H01B1/22C08L1/02H01C7/02H01C17/00
Inventor 雷跃文
Owner HEFEI SHENGDA ELECTRONIC TECH IND CO LTD
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